Cisco IP Phone users can block or mask caller ID displays for calls
from a particular phone. The display of caller ID information for outgoing
calls from a particular phone or gateway can be blocked or masked on a per-call
basis, which allows users to maintain their privacy when necessary.

This document describes how to block or hide the caller ID or transform
the caller ID for the outgoing calls on Cisco Unified Communications Manager
5.x and 6.x.

The information in this document is based on Cisco Unified
Communications Manager 5.x and 6.x.

The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.

Cisco Unified Communications Manager provides flexible configuration
options to allow and to restrict the display of the directory number and name
information for both calling and called or connected parties.

Calling ID or called party display/hide/transform feature can be
configured through the Cisco Unified Communications Manager Administration from
any one these locations:

From the Directory Number Configuration page, you can configure and
display the calling party ID that appears on the called party phone when a call
is placed from the line numbers (directory numbers) that are assigned to a
specific phone.

Choose Device > Phone.

The Find and List Phones page appears.

Select the phone that you want to configure.

The Phone Configuration page appears.

From the Association Information area on the left side of the page,
select the phone directory number for which you want to configure this
feature.

The Directory Number Configuration page appears.

The External Phone Number Mask field on this page indicates the phone
number (or mask) that is used to send Caller ID information when a call is
placed from this phone line.

You can enter a maximum of 24 numbers and X
characters. The Xs represent the directory number and must appear at the end of
the pattern.

For example, if you specify a mask of
975767XXXX, an external call from extension 1234 displays
a caller ID number of 9757671234. This value applies only to the current device
unless you check the Update Shared Device Settings check box
located to the right of the field and then click Propagate
Selected. (The Update Shared Device Settings check
box displays only if other devices share this directory number.)

Click Save in order to save the changes, and then
click Reset in order to apply the changes to this phone.

Note: Repeat the same procedure for all available phones and their
respective directory numbers.

You can configure this feature through the Route Pattern Configuration
page.

Note: The route pattern configuration overrides the directory number
configuration.

Choose Call Routing > Route/Hunt > Route
Pattern.

The Find and List Route Patterns page appears.

Find and locate the route pattern that you use currently for routing
calls to the PSTN, and then scroll down to the Calling Party Transformations
section.

Check or uncheck the Use Calling Party's External Phone
Number Mask check box.

If you check the Use Calling Party's External Phone Number
Mask check box, CallManager uses the number that you configured on the
Directory Number Configuration page as the caller ID.

If you uncheck the Use Calling Party's External Phone
Number Mask check box, then you can configure the Calling
Party Transform Mask. For example, you can enter the number
989898XXXX, and Cisco CallManager replaces
XXXX with the phone's 4-digit
extension.

You can configure this feature through the Gateway Configuration
page.

Note: The gateway configuration overrides all the previous
configurations.

Complete these steps to transform the calling party ID that appears on
the called party phone.

Choose Device > Gateway.

The Find and List Gateway page appears.

Select the PRI that you use for outgoing calls from the list of
records that display.

Scroll down to the Call Routing Information - Outbound Calls section
of the Gateway Configuration page.

Enter a number in the Caller ID DN field.

For example, 978858XXXX (CallManager fills out the XXXX with phone's
4-digit extension while the user makes calls).

Choose Allowed from the Calling Party Presentation
drop-down list.

The Allowed option allows CallManager to display the calling party
number or name.

Click Save in order to save the changes to
CallManager, and then click Reset in order to reset the
gateway for the changes to take effect.

Complete these steps in order to hide or block the calling party ID
that appears on the called party phone:

Choose Device > Gateway.

The Find and List Gateway page appears.

Select the PRI that you use for outgoing calls from the list of
records that display.

Scroll down to the Call Routing Information - Outbound
Calls section of the Gateway Configuration page.

Choose Restricted from the Calling Party
Presentation drop-down list.

The Restricted option is used to block the display of the calling
party number or name.

Click Save in order to save your changes to
CallManager, and click Reset in order to reset the gateway to
take effect the changes.

This configuration hides the calling ID that appears on the called
party phone. On the called ID side, calling ID appears as the text
Private Number, instead of the calling number. The user on
the called side is unable to see the calling number.

In the Cisco Unified Communications Manager Administration Page,
choose System > Service Parameters.

From the Server drop-down list, choose the server.

From the Service drop-down list, choose Cisco Callmanager
Service.

Under the Clusterwide Parameters (Device - Phone) section, scroll
down to Privacy Setting, set this parameter to True, and click
Update.

The Privacy Setting parameter determines whether
the Privacy feature is enabled for phones that use the Default value in the
Privacy setting on the Phone Configuration window in Cisco CallManager
Administration. Privacy removes the call information from all phones that share
lines and blocks other shared lines from barging in on its calls. Valid values
specify True (Privacy is enabled) or False (Privacy is disabled). Affected IP
phone(s) must be reset for the parameter change to take
effect.

Reset the affected IP phone(s) or click Save on the
affected Remote Destination Profile(s) in order for the parameter change to
take effect.

Here are a few things to remember in order to verify that your
configuration works properly:

If the Calling Party Presentation field is set to
Allowed in the gateway configuration, the transformation
of digits occur. For example, if a user from the extension 3000 calls a remote
location user, that remote user can see the calling number as
9788583000.

If the Calling Party Presentation field is set to
Restricted in the gateway configuration, the CallManager
hides the calling number while the user makes calls to outside. For example, if
a user from the extension 3000 calls a remote location user, that remote user
sees Private number only. The remove user is unable to see
the calling number.